Method for mounting shielding on a turbine casing, and mounting assembly for implementing same

Patent metadata

Field	Value
Publication number	US-9429038-B2
Application number	US-201113817057-A
Country	US
Kind code	B2
Filing date	Aug 23, 2011
Priority date	Aug 26, 2010
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A method and structure negating thermal inertia of a solid portion, such as shielding, which influences mechanical behavior of parts of an engine structure, by reducing forces transmitted to the engine structure during an event in which a turbine blade ruptures, while preserving mechanical strength and vibratory positioning. The structure includes a flexible fastener for a shield, enabling producing a fusible section. An assembly for mounting a shielding onto a casing of the engine structure of a turbine includes connection lugs and points for attachment to the casing and shielding. The attachment points are sufficiently spaced apart in accordance with curvature of the shielding and casing so connection between the lugs and the shielding or casing, and connection of the attachment points, are substantially tangential. The lugs are sized so the connection has sufficient flexibility to control vibratory positioning thereof and ensure sufficient mechanical strength under thermo-mechanical loads.

First claim

The invention claimed is:

1. A shield mounting method for retention on a casing of an engine structure of a turbine, comprising:
coupling a shield on the casing through a tangential connection oriented in a circumferential direction between points of the shield and the casing sufficiently spaced apart in accordance with a curvature of the shield and the casing between such points so as to implement a flexible coupling between the shield and the casing, configured to provide a vibratory positioning and a sufficient mechanical strength under a thermo-mechanical load,
wherein a first end of the tangential connection is fastened to the casing via a fastener having a fastener head arranged in an opening of the shield, and
wherein a second end of the tangential connection is connected to the shield and abuts an internal face of the shield.

2. A mounting method according to claim 1 , wherein a vibration dampening is provided in connection with the flexible coupling between the shield and the casing.

3. A mounting method according to claim 1 , wherein a connection sizing is determined in accordance with the thermo-mechanical load to which the tangential connection is submitted.

4. A mounting method according to claim 1 , wherein a number of tangential connections is determined and the tangential connections are distributed so as to minimize efforts resulting from thermo-mechanical transitions.

5. A shield and casing assembly of an engine structure of a turbine, comprising:
the shield;
the casing;
a connection lug between the casing and the shield with fastening points for the casing and the shield, the fastening points being sufficiently spaced apart in accordance with a curvature of the shield and the casing so that the connection lug is substantially tangential, and the connection lug presents a predetermined degree of flexibility,
wherein a first end of the connection lug is fastened to the casing via a fastener having fastener head arranged in an opening of the shield, and
wherein a second end of the connection lug is connected to the shield and abuts an internal face of the shield.

6. An assembly according to claim 5 , wherein a plurality of spring blades configured to dampen vibrations is in a ring configuration between the shield and the casing.

7. An assembly according to the claim 6 , wherein the spring blades are axially split.

8. An assembly according to claim 5 , wherein at least one fastening point on the shield and at least one fastening point on the casing are provided per lug.

9. An assembly according to claim 5 , wherein the lug fastening to the casing is implemented by screws in bosses welded to a casing skin, the screws presenting heads configured to be moved in openings formed in the shield.

10. An assembly according to claim 5 , wherein the lug fastening to the shield is implemented by rivets crossing the shield.

Assignees

• Sahores Jean-Luc Pierre
• Jaureguiberry Carole
• Casaux-Bic Jean-Maurice
• Descubes Olivier Pierre
• Turbomeca

Inventors

• Sahores Jean-Luc Pierre
• Jaureguiberry Carole
• Casaux-Bic Jean-Maurice
• Descubes Olivier Pierre

Classifications

• F04D27/008

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• F04D27/0261

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• F02C7/05

  having provisions for obviating the penetration of damaging objects or particles · CPC title

• Y10T29/49323

  Assembling fluid flow directing devices, e.g., stators, diaphragms, nozzles · CPC title

• F02K1/82

  Jet pipe walls, e.g. liners · CPC title